I guess you mean the Murata EMIFIL NFM/L/R/E range? excellent parts, they look like 4 terminal but are 3 terminal. they come in larger than 0603 these days, right up to 2220

There are other manufacturers like TDK that make similar products but, in my opinion, with less performance. After all passing years I will (finally) have the chance to solder some in January on a new board that will come out soon.
Cheers,
L

If i properly understood, than if i want to use isolated i2s output i need separate 3.3V power supply. How do do it properly ?
I am using TP Placid to power my WaeIO. Can i just connect another regulator to 5v Placid output to get 3.3 V ? Any hints ?

If i properly understood, than if i want to use isolated i2s output i need separate 3.3V power supply. How do do it properly ?
I am using TP Placid to power my WaeIO. Can i just connect another regulator to 5v Placid output to get 3.3 V ? Any hints ?

The voltage that you supply the 'clean' side should be the same as the logic voltage level expected by your DAC.

You should not use the placid reg that supplies the WaveIO as this then passes the noise propagating on the ground connection to the 'clean' side and this negates the intention of the isolator. So a separate regulated supply should be provided to the 'clean' side of the WaveIO isolated output.

I use currently a lt1084-regged psu for the isolator...and I am wondering if not taking the 3.3v from the buffalo-dac would not be even better, e.g. from the i2c connector ? I read somewhere that looking at the isolator psu wise as part of the dac makes most sense, so identical noise is helpful. If that is the case...which 3.3v tap from the buffalo is adviseable ? I believe there are at least two different areas or regs i could try to use...